120 Lachesis
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| Discovery | |
|---|---|
| Discovered by: | Alphonse Borrelly |
| Discovery date: | April 10, 1872 |
| Alternative names: | |
| Minor planet category: | Main belt |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion distance: | 493.828 Gm (3.301 AU) |
| Perihelion distance: | 438.480 Gm (2.931 AU) |
| Semi-major axis: | 466.154 Gm (3.116 AU) |
| Eccentricity: | 0.059 |
| Orbital period: | 2009.115 d (5.50 a) |
| Avg. orbital speed: | 16.86 km/s |
| Mean anomaly: | 150.174° |
| Inclination: | 6.954° |
| Longitude of ascending node: | 341.511° |
| Argument of perihelion: | 232.006° |
| Physical characteristics | |
| Dimensions: | 174.1 km |
| Mass: | 5.5×1018 kg |
| Mean density: | ? g/cm³ |
| Equatorial surface gravity: | 0.0487 m/s² |
| Escape velocity: | 0.0920 km/s |
| Rotation period: | ? d |
| Albedo: | ? |
| Temperature: | ~158 K |
| Spectral type: | C |
| Absolute magnitude: | 7.75 |
120 Lachesis is a very large and very dark main belt asteroid. As a primitive C-type asteroid it is likely composed of carbonates. It was discovered by Alphonse Borrelly on April 10, 1872 and named after one of the Moirae, or Fates, in Greek mythology. The only observed Lachesean occultation occurred in 1999 and was recorded in the south-western United States.
| Minor planets | ||
|---|---|---|
| Previous minor planet | 120 Lachesis | Next minor planet |
| List of asteroids | ||
Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Comets · Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud)
For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons and the Solar System.
For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.
